@Test(expected = CtException.class)
 public void closeException() throws Exception {
   ctSessionFactory.openSession();
   ctSessionFactory.closeSession();
   ctSessionFactory.close();
   ctSessionFactory.close();
 }
 @Test
 public void close() throws Exception {
   ctSessionFactory.openSession();
   ctSessionFactory.closeSession();
   ctSessionFactory.close();
 }